date: 6418-75-51

$ php main.php
PHP Fatal error:  Uncaught Exception: Failed to parse time string (6418-75-51) at position 6 (5): Unexpected character in /tmp/symfony-yaml/vendor/symfony/yaml/Inline.php:714
Stack trace:
#0 /tmp/symfony-yaml/vendor/symfony/yaml/Inline.php(714): DateTimeImmutable->__construct()
#1 /tmp/symfony-yaml/vendor/symfony/yaml/Inline.php(312): Symfony\Component\Yaml\Inline::evaluateScalar()
#2 /tmp/symfony-yaml/vendor/symfony/yaml/Inline.php(80): Symfony\Component\Yaml\Inline::parseScalar()
#3 /tmp/symfony-yaml/vendor/symfony/yaml/Parser.php(790): Symfony\Component\Yaml\Inline::parse()
#4 /tmp/symfony-yaml/vendor/symfony/yaml/Parser.php(341): Symfony\Component\Yaml\Parser->parseValue()
#5 /tmp/symfony-yaml/vendor/symfony/yaml/Parser.php(86): Symfony\Component\Yaml\Parser->doParse()
#6 /tmp/symfony-yaml/vendor/symfony/yaml/Yaml.php(77): Symfony\Component\Yaml\Parser->parse()
#7 /tmp/symfony-yaml/main.php(8): Symfony\Component\Yaml\Yaml::parse()
#8 {main}
  thrown in /tmp/symfony-yaml/vendor/symfony/yaml/Inline.php on line 714

$ php main.php
/tmp/symfony-yaml/main.php:8:
array(1) {
  'date' =>
  string(10) "6418-75-51"
}